Re: New to the fun
Welcome to the forum. By definition, there are no standard procedures for a DIY motorbike. Seems like most guys get the engine mounted securely and proceed from there. Just my opinion, but if this is your first motorbike build, I would purchase a kit motor. You will not have to worry about damaging the Trek frame with a kit and you will be on the road sooner. I would install a kit motor, ride and learn to solve the basic problems before tackling a custom motorbike build. If you are experienced with small engine mounting and maintenance, go ahead and build a custom ride.
“You're only young once, but you can be immature as long as you like" -Unknown